A seven-year University of Cincinnati study found that people with Parkinson’s disease who remained physically active for more than eight hours a week experienced substantially less cognitive decline and slower progression of movement-related symptoms, suggesting that regular activity may play an important role in long-term disease management.
By yourNEWS Media Newsroom
People living with Parkinson’s disease who regularly engage in physical activity may experience slower deterioration in memory, thinking and movement, according to new research showing that patients reporting more than eight hours of weekly activity maintained significantly better neurological function than those who were less active.
The findings, published Oct. 7 in the medical journal Neurology, offer additional evidence that sustained physical activity could benefit patients beyond improving mobility and physical conditioning. Researchers observed differences in both cognitive and motor performance over several years, with the greatest benefits associated with higher amounts of weekly activity rather than more strenuous exercise.
Conducted by researchers at the University of Cincinnati and collaborating institutions, the investigation followed 294 adults diagnosed with mild-to-moderate Parkinson’s disease. Participants had an average age of approximately 66 and were monitored for up to seven years, allowing investigators to examine changes in neurological function over an extended period.
The findings have implications for a condition characterized by progressively worsening movement difficulties and, in many patients, changes in memory, concentration and other cognitive abilities. Although medications can help manage symptoms, researchers continue searching for interventions that might preserve neurological function and independence as the disease advances.
“Parkinson’s disease is a brain disorder that causes movement and cognitive problems that gradually worsen, leading to disability and a loss of independence,” said study author Dr. Dong-Woo Ryu of the University of Cincinnati and the Catholic University of Korea.
“Previous research has shown associations between physical activity and movement symptoms. Our study found physical activity may have dual benefits, with associations with slower declines in movement and cognition.”
The American Academy of Neurology’s summary of the research reported particularly notable differences in cognitive performance between participants with the highest and lowest activity levels.
Researchers divided patients into three categories based on their reported weekly physical activity. The least active group performed no more than four hours per week, the middle group reported four to eight hours, and the most active participants exceeded eight hours.
Cognitive function was measured using the Montreal Cognitive Assessment, a standardized test scored from zero to 30 that evaluates memory, attention, language and other thinking abilities. Lower scores indicate greater cognitive impairment.
Over the observation period, participants in the lowest activity category experienced an estimated annual decline of 0.478 points. Those reporting four to eight hours of activity declined by approximately 0.090 points annually.
Among participants exceeding eight hours of weekly activity, the estimated decline was just 0.007 points per year, indicating relatively stable cognitive performance over the period examined.
Movement-related findings followed a similar pattern. Investigators used the motor examination component of the Movement Disorder Society–Unified Parkinson’s Disease Rating Scale, which evaluates symptoms such as tremors, rigidity, slowed movement and difficulties with physical coordination.
The scale ranges from zero to 132, with higher scores reflecting more severe movement impairment.
Participants in the least active group experienced an average annual increase of 0.143 points, indicating worsening symptoms. Those in the middle category showed an average decrease of 0.225 points, while patients reporting more than eight hours of weekly activity experienced an estimated annual reduction of 0.783 points.
Although the numerical changes on the motor scale were relatively modest, the differences between activity groups remained statistically significant after researchers accounted for several demographic and disease-related factors.
The study’s published findings showed that higher levels of physical activity were associated with slower cognitive deterioration and more favorable movement scores, suggesting that staying active could help patients maintain functional abilities over time.
Importantly, the researchers did not find convincing evidence that vigorous exercise independently provided greater neurological benefits once total activity time was taken into account.
The analysis considered three measures: total weekly activity duration, overall physical activity volume adjusted for intensity, and time spent performing vigorous exercise.
While each measure was initially associated with more favorable outcomes, the independent relationship between vigorous activity and disease progression disappeared after investigators adjusted for total activity time.
That finding suggests that the duration and consistency of physical activity may be more important than the intensity of individual workouts.
For patients unable to tolerate demanding exercise routines, the results offer a potentially more accessible approach to maintaining physical activity.
The researchers included activities performed at work, around the home and during recreational pursuits rather than restricting their evaluation to structured exercise sessions.
Moderate activities included brisk walking, doubles tennis, light swimming, vacuuming, washing windows and mowing the lawn. More vigorous activities included jogging, fast bicycling, singles tennis, team sports, shoveling and carrying heavy objects.
By accounting for everyday movement, investigators were able to evaluate whether regularly accumulated physical activity was associated with slower neurological decline.
The study also examined whether recent physical activity or exercise habits established years earlier were more closely associated with subsequent outcomes.
Researchers found that activity performed closer to the assessment period remained associated with slower deterioration even after accounting for participants’ reported physical activity over the preceding decade.
The result suggests that maintaining regular movement after a Parkinson’s diagnosis may remain relevant, rather than the potential benefits depending exclusively on physical conditioning developed earlier in life.
“The possible benefits of physical activity for people with Parkinson’s disease may depend on how long they stay active and whether they continue exercising over time,” Ryu said in a University of Cincinnati report discussing the findings.
The research was conducted using data from the Cincinnati Cohort Biomarker Program, an ongoing initiative examining neurological changes in patients with Parkinson’s and related disorders.
Participants completed standardized questionnaires estimating the time they spent performing physical activities each week. Investigators then compared those reports with annual clinical assessments to examine how symptoms changed.
Cognitive evaluations were available for up to five years, while motor assessments extended as long as seven years. The differing observation periods allowed researchers to analyze each outcome using the available long-term data.
However, the researchers emphasized that the findings do not establish that physical activity directly prevents or slows the biological progression of Parkinson’s disease.
Because the investigation was observational rather than a randomized clinical trial, participants were not assigned to different exercise programs. Instead, researchers examined relationships between naturally occurring differences in physical activity and subsequent changes in clinical measurements.
This distinction creates the possibility of reverse causation, meaning that people with milder Parkinson’s symptoms may have remained more physically active precisely because their disease was progressing more slowly.
Dr. Derk W. Krieger, a neurology consultant, identified this concern as an important limitation when interpreting the findings.
“Reverse causation is a major concern—patients with milder disease may simply be more active,” Krieger said.
Self-reported activity measurements represent another limitation because patients may overestimate or underestimate how much time they spend exercising or performing physically demanding tasks.
Differences in overall health, mobility, motivation, disease severity and other factors could also influence both exercise habits and neurological outcomes.
Additionally, the participants generally had relatively preserved cognitive abilities when the study began. That characteristic limits how confidently the results can be applied to patients with advanced Parkinson’s disease or substantial cognitive impairment.
Ryu acknowledged that additional investigations will be necessary before researchers can determine whether increasing physical activity produces measurable changes in the underlying disease process.
“Our study was observational, so we cannot establish causality,” he said.
The researchers nevertheless concluded that their findings support further investigation into physical activity as a potentially modifiable factor in Parkinson’s management.
“Our study found physical activity may have dual benefits, with associations with slower declines in movement and cognition,” Ryu said.
The findings contribute to a growing body of research examining whether exercise influences neurological pathways involved in movement, memory and cognition.
Parkinson’s disease is associated with the progressive loss of dopamine-producing nerve cells in areas of the brain responsible for coordinating movement. As the disease advances, patients may develop tremors, muscle stiffness, impaired balance, slowed movement and difficulties performing routine activities.
Some patients also experience cognitive changes involving attention, planning, memory and decision-making. These symptoms can become increasingly disabling and may eventually contribute to Parkinson’s disease dementia.
Researchers have proposed several mechanisms through which physical activity might influence neurological function, including improvements in cardiovascular health, reduced inflammation and increased neuroplasticity.
Neuroplasticity refers to the brain’s ability to adapt and reorganize connections between nerve cells. Investigators are interested in whether regular physical activity can support these processes and potentially compensate for some functional changes associated with neurodegenerative diseases.
Although these mechanisms remain under investigation, exercise has already been associated with improvements in balance, mobility, muscle strength and quality of life among people living with Parkinson’s.
The latest study adds cognitive function to the list of outcomes that warrant additional attention.
Dr. Daniel Truong, a neurologist who has evaluated the research, emphasized that larger randomized trials are needed to determine whether physical activity changes the underlying course of Parkinson’s rather than primarily improving clinical symptoms.
“Randomized studies are needed to determine if exercise genuinely modifies the disease, not just masks symptoms,” Truong said.
Such studies could assign patients to different activity programs and measure neurological outcomes over time, allowing researchers to more directly examine whether exercise causes the observed benefits.
Future investigations may also incorporate wearable activity monitors to obtain more accurate measurements of daily movement.
Smartwatches and other motion-tracking devices could provide continuous information about activity duration, intensity and consistency, reducing reliance on patient recollection.
Researchers are also interested in using brain imaging, blood tests and other biological markers to better understand how physical activity relates to neurological changes.
Those measurements could help determine whether exercise affects biological processes involved in Parkinson’s progression or primarily improves patients’ ability to compensate for symptoms.
The University of Cincinnati’s original research announcement emphasized the importance of interpreting the findings as an association rather than proof of a treatment effect.
The distinction is particularly relevant because the study does not establish that eight hours represents a medically necessary exercise threshold. That amount was used to separate the most active participants from those reporting lower activity levels.
The findings therefore should not be interpreted as requiring every Parkinson’s patient to perform more than eight hours of exercise weekly to obtain health benefits.
Patients differ considerably in their physical capabilities, balance, cardiovascular fitness and disease severity. For some individuals, attempting that amount of activity without appropriate supervision could increase the risk of falls, fatigue or injury.
Truong advised patients to begin with manageable activity levels, including short sessions of movement lasting approximately 10 minutes, and gradually establish routines suited to their abilities.
Activities such as walking, swimming and dancing may help patients remain engaged, while participation with family members or organized groups can provide social interaction and encouragement.
He also suggested that patients monitor improvements in balance, energy and mood as ways of assessing their personal progress.
Exercise should remain part of a comprehensive treatment plan rather than replacing prescribed medications, neurological evaluations or other established therapies.
“It’s part of a comprehensive care plan,” Truong said.
Current Parkinson’s treatments commonly include medications such as levodopa, which helps replenish dopamine activity and manage movement symptoms. Some patients also benefit from physical therapy, occupational therapy, speech therapy or other individualized interventions.
The new research does not establish that exercise can replace these treatments, but it supports continued investigation into how sustained physical activity can complement conventional care.
The potential importance of accessible movement is especially relevant as Parkinson’s disease becomes more prevalent among aging populations.
Unlike costly medical interventions, many forms of physical activity can be performed at home or in community settings with relatively limited equipment, although individual needs and safety precautions vary.
The study suggests that regular participation in manageable activities may be associated with more favorable long-term outcomes even when those activities do not involve strenuous athletic training.
For researchers, the next challenge is determining whether the observed differences reflect a protective biological effect, better overall health among active patients, or a combination of factors.
Until randomized trials provide stronger evidence, the findings support the role of physical activity in Parkinson’s care without establishing that it independently slows the disease itself.
The seven-year investigation nevertheless offers an important perspective on long-term symptom management: Patients who maintained higher levels of regular movement experienced less decline in both thinking and movement, providing a basis for further research into how everyday activity may help preserve independence and quality of life.
Source: Natural News
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